We have proposed and demonstrated a novel measurement technique for characterizing nonlinear frequency sweep in high-speed tunable laser sources by using a simple self- homodyne setup and Hilbert transformation. Measurement results, such as the variation in frequency scanning rate during a frequency sweeping process, are presented for a temperature-tuned distributed feedback laser diode and external cavity tunable laser. The time-varying optical phase of the incident light of a laser is calculated from the integration of the instantaneous optical frequency, and the tuning rate is obtained from its derivative.
© 2007 Optical Society of America
Instrumentation, Measurement, and Metrology
Original Manuscript: August 30, 2006
Revised Manuscript: November 4, 2006
Manuscript Accepted: November 28, 2006
Published: April 9, 2007
Tae-Jung Ahn and Dug Young Kim, "Analysis of nonlinear frequency sweep in high-speed tunable laser sources using a self-homodyne measurement and Hilbert transformation," Appl. Opt. 46, 2394-2400 (2007)